6.2.3.9 IfcDistributionSystem
6.2.3.9.1 Semantic definition
A distribution system is a network designed to receive, store, maintain, distribute, or control the flow of a distribution media. A common example is a heating hot water system that consists of a pump, a tank, and an interconnected piping system for distributing hot water to terminals.
The group IfcDistributionSystem defines the occurrence of a specialized system for use within the context of building services or utilities for built facilities.
Important functionalities for the description of a distribution system are derived from existing IFC entities:
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From IfcSystem it inherits the ability to couple the built system via IfcRelReferencedInSpatialStructure to one or more IfcSpatialElement subtypes as necessary.
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From IfcGroup it inherits the inverse attribute IsGroupedBy, pointing to the relationship class IfcRelAssignsToGroup. This allows the grouping of distribution elements (instances of IfcDistributionElement subtypes).
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From IfcObjectDefinition it inherits the inverse attribute IsDecomposedBy pointing to the relationship class IfcRelAggregates. It provides the hierarchy between the separate (partial) distribution systems. For example, an electrical main circuit may be aggregated into branch circuits.
6.2.3.9.2 Entity inheritance
6.2.3.9.3 Attributes
# | Attribute | Type | Description |
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IfcRoot (4) | |||
1 | GlobalId | IfcGloballyUniqueId |
Assignment of a globally unique identifier within the entire software world. |
2 | OwnerHistory | OPTIONAL IfcOwnerHistory |
Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object, |
3 | Name | OPTIONAL IfcLabel |
Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule. |
4 | Description | OPTIONAL IfcText |
Optional description, provided for exchanging informative comments. |
IfcObjectDefinition (7) | |||
HasAssignments | SET [0:?] OF IfcRelAssigns FOR RelatedObjects |
Reference to the relationship objects, that assign (by an association relationship) other subtypes of IfcObject to this object instance. Examples are the association to products, processes, controls, resources or groups. |
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Nests | SET [0:1] OF IfcRelNests FOR RelatedObjects |
References to the decomposition relationship being a nesting. It determines that this object definition is a part within an ordered whole/part decomposition relationship. An object occurrence or type can only be part of a single decomposition (to allow hierarchical structures only). |
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IsNestedBy | SET [0:?] OF IfcRelNests FOR RelatingObject |
References to the decomposition relationship being a nesting. It determines that this object definition is the whole within an ordered whole/part decomposition relationship. An object or object type can be nested by several other objects (occurrences or types). |
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HasContext | SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions |
References to the context providing context information such as project unit or representation context. It should only be asserted for the uppermost non-spatial object. |
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IsDecomposedBy | SET [0:?] OF IfcRelAggregates FOR RelatingObject |
References to the decomposition relationship being an aggregation. It determines that this object definition is whole within an unordered whole/part decomposition relationship. An object definition can be aggregated by several other objects (occurrences or parts). |
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Decomposes | SET [0:1] OF IfcRelAggregates FOR RelatedObjects |
References to the decomposition relationship being an aggregation. It determines that this object definition is a part within an unordered whole/part decomposition relationship. An object definition can only be part of a single decomposition (to allow hierarchical structures only). |
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HasAssociations | SET [0:?] OF IfcRelAssociates FOR RelatedObjects |
Reference to the relationship objects, that associates external references or other resource definitions to the object. Examples are the association to library, documentation or classification. |
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IfcObject (5) | |||
5 | ObjectType | OPTIONAL IfcLabel |
The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute PredefinedType is set to USERDEFINED or when the concrete entity instantiated does not have a PredefinedType attribute. The latter is the case in some exceptional leaf classes and when instantiating IfcBuiltElement directly. |
IsDeclaredBy | SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects |
Link to the relationship object pointing to the declaring object that provides the object definitions for this object occurrence. The declaring object has to be part of an object type decomposition. The associated IfcObject, or its subtypes, contains the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes. |
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Declares | SET [0:?] OF IfcRelDefinesByObject FOR RelatingObject |
Link to the relationship object pointing to the reflected object(s) that receives the object definitions. The reflected object has to be part of an object occurrence decomposition. The associated IfcObject, or its subtypes, provides the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes. |
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IsTypedBy | SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects |
Set of relationships to the object type that provides the type definitions for this object occurrence. The then associated IfcTypeObject, or its subtypes, contains the specific information (or type, or style), that is common to all instances of IfcObject, or its subtypes, referring to the same type. |
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IsDefinedBy | SET [0:?] OF IfcRelDefinesByProperties FOR RelatedObjects |
Set of relationships to property set definitions attached to this object. Those statically or dynamically defined properties contain alphanumeric information content that further defines the object. |
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IfcGroup (2) | |||
IsGroupedBy | SET [0:?] OF IfcRelAssignsToGroup FOR RelatingGroup |
Reference to the relationship IfcRelAssignsToGroup that assigns the one to many group members to the IfcGroup object. |
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ReferencedInStructures | SET [0:?] OF IfcRelReferencedInSpatialStructure FOR RelatedElements |
Reference to the relationship IfcRelReferencedInSpatialStructure that relates the group to a spatial element. |
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IfcSystem (2) | |||
ServicesBuildings | SET [0:1] OF IfcRelServicesBuildings FOR RelatingSystem |
Reference to the spatial structure via the objectified relationship IfcRelServicesBuildings, which is serviced by the system. |
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ServicesFacilities | SET [0:?] OF IfcRelReferencedInSpatialStructure FOR RelatedElements |
Reference to the relationship IfcRelReferencedInSpatialStructure that relates the system to a spatial element. |
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Click to show 20 hidden inherited attributes Click to hide 20 inherited attributes | |||
IfcDistributionSystem (2) | |||
6 | LongName | OPTIONAL IfcLabel |
Long name for a distribution system, used for informal purposes. It should be used, if available, in conjunction with the inherited Name attribute. |
7 | PredefinedType | OPTIONAL IfcDistributionSystemEnum |
A list of types to further identify the object. Some property sets may be specifically applicable to one of these types. |
6.2.3.9.4 Formal propositions
Name | Description |
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CorrectPredefinedType |
Either the PredefinedType attribute is unset, or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED. |
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6.2.3.9.5 Property sets
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Pset_Condition
- AssessmentDate
- AssessmentCondition
- AssessmentDescription
- AssessmentType
- AssessmentMethod
- LastAssessmentReport
- NextAssessmentDate
- AssessmentFrequency
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Pset_DistributionSystemCommon
- Reference
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Pset_DistributionSystemTypeElectrical
ELECTRICAL
- ElectricalSystemType
- ElectricalSystemCategory
- Diversity
- NumberOfLiveConductors
- MaximumAllowedVoltageDrop
- NetImpedance
- RatedVoltageRange
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Pset_DistributionSystemTypeOverheadContactlineSystem
OVERHEAD_CONTACTLINE_SYSTEM
- SpanNominalLength
- ContactWireStagger
- ContactWireNominalDrop
- PressureRange
- ContactWireNominalHeight
- ContactWireUplift
- ElectricalClearance
- NumberOfOverlappingSpans
- PantographType
- TensionLength
- OCSType
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Pset_DistributionSystemTypeVentilation
VENTILATION
- DesignName
- DuctSizingMethod
- PressureClass
- LeakageClass
- FrictionLoss
- ScrapFactor
- DuctSealant
- MaximumVelocity
- AspectRatio
- MinimumHeight
- MinimumWidth
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Pset_InstallationOccurrence
- InstallationDate
- AcceptanceDate
- PutIntoOperationDate
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Pset_MaintenanceStrategy
- AssetCriticality
- AssetFrailty
- AssetPriority
- MonitoringType
- AccidentResponse
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Pset_MaintenanceTriggerCondition
- ConditionTargetPerformance
- ConditionMaintenanceLevel
- ConditionReplacementLevel
- ConditionDisposalLevel
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Pset_MaintenanceTriggerDuration
- DurationTargetPerformance
- DurationMaintenanceLevel
- DurationReplacementLevel
- DurationDisposalLevel
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Pset_MaintenanceTriggerPerformance
- TargetPerformance
- PerformanceMaintenanceLevel
- ReplacementLevel
- DisposalLevel
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Pset_PowerControlSystem
ELECTRICAL
- AssemblyInstruction
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Pset_ProcessCapacity
- ProcessItem
- ProcessCapacity
- ProcessPerformance
- DownstreamConnections
- UpstreamConnections
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Pset_RepairOccurrence
- RepairContent
- RepairDate
- MeanTimeToRepair
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Pset_Risk
- RiskName
- RiskType
- NatureOfRisk
- RiskAssessmentMethodology
- UnmitigatedRiskLikelihood
- UnmitigatedRiskConsequence
- UnmitigatedRiskSignificance
- MitigationPlanned
- MitigatedRiskLikelihood
- MitigatedRiskConsequence
- MitigatedRiskSignificance
- MitigationProposed
- AssociatedProduct
- AssociatedActivity
- AssociatedLocation
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Pset_ServiceLifeFactors
- QualityOfComponents
- DesignLevel
- WorkExecutionLevel
- IndoorEnvironment
- OutdoorEnvironment
- InUseConditions
- MaintenanceLevel
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Pset_TractionPowerSystem
ELECTRICAL
- PowerSupplyMode
- ElectrificationType
- RatedFrequency
- NominalVoltage
6.2.3.9.6 Concept usage
Concept | Usage | Description | |
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IfcRoot (2) | |||
Revision Control | General |
Ownership, history, and merge state is captured using IfcOwnerHistory. |
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Software Identity | General |
IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept. |
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IfcObjectDefinition (9) | |||
Classification Association | General |
Any object occurrence or object type can have a reference to a specific classification reference, i.e. to a particular facet within a classification system. |
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Aggregation | General |
No description available. |
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Approval Association | General |
No description available. |
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Constraint Association | General |
No description available. |
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Document Association | General |
No description available. |
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Library Association | General |
No description available. |
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Material Association | General |
No description available. |
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Material Single | General |
No description available. |
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Nesting | General |
No description available. |
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IfcObject (5) | |||
Object Predefined Type | General |
No description available. |
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Object Typing | General |
Any object occurrence can be typed by being assigned to a common object type utilizing this concept. A particular rule, restricting the applicable subtypes of IfcTypeObject that can be assigned, is introduced by overriding this concept at the level of subtypes of IfcObject. This concept can be applied to the following resources: |
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Object User Identity | General |
An attribute Name and optionally Description can be used for all subypes of IfcObject. For those subtypes, that have an object type definition, such as IfcBeam - IfcBeamType, the common Name and optionally Description is associated with the object type. |
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Property Sets with Override | General |
Any object occurrence can hold property sets, either directly at the object occurrence as element specific property sets, or at the object type, as type property sets. In this case, the properties that are provided to the object occurrence are the combinations of element specific and type properties. In case that the same property (within the same property set) is defined both in occurrence and type properties, the property value of the occurrence property overrides the property value of the type property. |
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Assignment to Group | General |
No description available. |
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IfcGroup (2) | |||
Group Assignment | General |
The IfcGroup establishes an arbitrary collection of objects through utilizing this concept. |
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Property Sets for Objects | General |
This concept can be applied to the following resources: |
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IfcSystem (2) | |||
Property Sets for Objects | General |
This concept can be applied to the following resources: |
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System Element Attributes | General |
No description available. |
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Click to show 20 hidden inherited concepts Click to hide 20 inherited concepts | |||
IfcDistributionSystem (2) | |||
Group Assignment | General |
For the most common case of an IfcDistributionElement subtype containing ports of a particular PredefinedType that all belong to the same distribution system, the IfcDistributionElement is assigned to the IfcDistributionSystem via the IfcRelAssignsToGroup relationship, where IfcDistributionPort's are implied as part of the corresponding system based on their PredefinedType. An IfcDistributionElement may belong to multiple systems, however only one IfcDistributionSystem of a particular PredefinedType. For rare cases where an IfcDistributionElement subtype contains ports of the same PredefinedType yet different ports belong to different systems, alternatively each IfcDistributionPort may be directly assigned to a single IfcDistributionSystem via the IfcRelAssignsToGroup relationship, where the PredefinedType must match. Such assignment indicates that the IfcDistributionSystem assigned from the IfcDistributionPort overrides any such system of the same PredefinedType assigned from the containing IfcDistributionElement, if any. Additionally, an IfcDistributionSystem may in turn be assigned to an IfcDistributionPort indicating the host or origination of the system using IfcRelAssignsToProduct. Figure 6.2.3.9.A — Distribution system assignment |
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Property Sets for Objects | General |
This concept can be applied to the following resources:
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6.2.3.9.7 Formal representation
ENTITY IfcDistributionSystem
SUPERTYPE OF (ONEOF
(IfcDistributionCircuit))
SUBTYPE OF (IfcSystem);
LongName : OPTIONAL IfcLabel;
PredefinedType : OPTIONAL IfcDistributionSystemEnum;
WHERE
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR
(PredefinedType <> IfcDistributionSystemEnum.USERDEFINED) OR
((PredefinedType = IfcDistributionSystemEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
END_ENTITY;